Grate section



1,621,302 W. WYAND @RATE SECTION March 15 1927,

Filed April 5, 1926 a' f- /'/.3 r 4,4 l I l converge upwardly. The crossbars 9 are` izioz WILLIAM WYAND, or Ansnoon, NEW JERSEY.

- GBATE SECTION.

Application inea aprii 5,1926. serial No. 99,821.

This inventionrelates to the grates used in steam boilersfor burning low grade coal or culm which yhas inuch dirt and dust in it; and it consists of a grate section or fuel plateconstructed as hereinafter fully described and claimed and operating to burn such low grade fuel to vvery great advantage.

In the drawings, Figure 1 isa plan view of a grate section Vconstrrictedfaccording to this invention. Fig. 2 is an end View of thev same. Fig. 3 is a cross-section, taken on the line 3 3 in Fig. 1. Fig. a is aside view of the grate section. Fig. 5 is a vcross-section similar to Fig. 3 but'shows a simple forinf or modification of the ribs which extend over the air channels. 1

The grate is formed of a multiplicity lof similar grate sections supported in a frame of any approved construction. The grate sections are usually arranged end to end in as many rows as will mali-e' the grate of the required width, but each grate section may be supported in a Iseparate vpocket in the sframe if desired. I v l Each grate section is integrally formed,

and is provided with two longitudinal supporting bars 6 arranged parallel to each other. Inner crossbars 7 are formed between the longitudinal bars 6, and are spaced apart to form oblong air channels 8. Tt

the crossbars are flush with the tops of the widest part of the longitudinal bars, and the crossbars are substantially one-half the depth of the longitudinal bars. Outer crossbars 9 project from the opposite'sides of the longitudinal bars 6, and are preferably extensions ofthe inner crossbars 7 but they do not necessarily have to be in line with them. Oblong air channels 11 areV formed between the outer crossbars9.

The bars 6, 7 and 9 are all tapered in cross-section, so that the air channels all preferably of the same width and depth as the crossbars 7, and their tops are also liush with the longitudinal bars 6. Lugs 10 are formed on one side of the crossbars 7 and 9 at one end of the grate section, and have vertical air channels 12 between them. The lugs 10 assist in supporting the grate section in the frame.

Ribs lllvand 15 are formed longitudinally of the grate section, and are arranged parallel to each other and atsubstantially equal distances apart. Two of these ribs 14C are i ne tops of Y arranged over the wide upper parts ofthe longitudinal bars 6. One rib 15 is arrangedk crosswise over the inner crossbars 7 'midway of their length, and a similar-'rib v15 is arranged substantially midway of the length of each of the outer crossbars 9. vThese ribs 1 4' and 15. are narrower than the wide upper parts of the longitudinal bars 6, and they Vform a series of longitudinall channels 16 which are relatively shallow, each channel f being about twice as wide vas. deep. The ends 17 of the ribs are preferablyroundedy olf.

The ribs l5 projectl above the crossbars 9 and across the air channels 11 between them, and their bottoms 18 are preferably arranged a little below the level o f the tops of the crossbars, and are rounded or inclined so that the air may pass upwardly freely from the air` channels below them.` The ribs 15 are preferablycyhn'drical in form between the'cross-V bars, butl the exact form' isv not material.

Tlieyare preferably made of asi'ze that will perinit'themetal to flow freely inthe mold, so that satisfactory castings can` bemadeyin Y large quantities.l

`In the form of the fgrate. section shown in Fig. 5, the bottoms 18" of the ribs 15 are arranged level with thetops of the crossbars. This ris a. satisfactory arrangement for burning the fuel, but is less satisfactory to manufacture in quantities, and the ribs are liable to burn away more quickly, than in the form shown in Fig.` 3. In each form the ribs prevent clinlrers from being formed in the air channels, andas the major portions of the air channels are unobstructed the air can pass upwardly very freely to all parts of the fuel. The open-ended air channels v11 enable vthe, imperforate surfaceof the grate to be reduced *materially The openings at lthe tops of the air vchannels are made of substantially equal area by spacing the'ribs and bars as shown. Y

A suitable poker orother tool is slid along the longitudinal channels 16 between the ribs as often as necessary to stir up the fuel and break up clinkers which have formed.V VThe* ribs also'support thev rake used for removing the clinkers, and prevent it from catching in the oblong air passages andV deep longitudinal bars 6 afford the necessaryV strength to prevent the grate section fromA The air is divided up into sinallf i breaking, and more or less of them, and

more or less thanfiv'e ribs can be provided for supporting the fuel, but five ribs are preferred for ordinary boiler grates.

What I claim is:

l. An integrally formed grate section forV burning culm, comprising longitudinal supporting bars, inner cro'ssbars extending between the. longitudinal bars and forming oblong air channels, outer crossbars projecting from the outer sides of the longitudinal'bars and formingoblong open-ended air channels, and longitudinal upwardly projecting ribs whichV extend crosswise over the tops of the said air channels and over the surfaces of the crossbars between them,

- said ribs being of much less. depth than the crossbars and leaving the air channels be- Y tween theYV crossbars substantially unobs tructed. y Y

2. A grate section as seti forth in claim l,

the Vsaid longitudinal bars and crossbars being tapered in cross-sectionrand widest at their upper parts;

* rounded at the tops of the longitudinal supporting` bars intermedi-ate of the adjacent ends vof the air channels. Y

6. A grate section as setforth in claim 1, and having also longitudinal ribs arranged at the topsof the longitudinal supporting bars intermediate of the adjacent ends of the air Channels, all of the said yribs being arranged at .substantially e ual distances apart, and the openings at t e tops of the air channels being all of substantially equal area.

7. An integrally formed grate sectionV comprising` longitudinal bars, crossbars extending between the longitudinal bars and forming a series of oblong air channels, said crossbars having extensions which project at the outer sides of the longitudinal bars and form two series of open-ended air channels, and longitudinal ribs arranged above the tops of the said crossbars and their extensions and extending across them and' ldie air passages vbetween them, said ribs being of much less depth than the crossbars and leavingA the said air channels substantially unobstructed.

8. A grate section as set forth in claim 7 and having also lugs on one side of the crossbar and its extensions at one end ofthe grate section, air channels being formed between the said lugs.

In testimony whereof l have aflixed my signature.

WILLIAM WYAND. 

